Refactor `scrollToAnnotation` handler to reduce nesting

src/annotator/guest.js

@@ -293,12 +293,13 @@ export default class Guest {
     });
 
     this.crossframe.on('scrollToAnnotation', tag => {
-      for (let anchor of this.anchors) {
-        if (anchor.highlights) {
-          if (anchor.annotation.$tag === tag) {
+      const anchor = this.anchors.find(a => a.annotation.$tag === tag);
+      if (!anchor?.highlights) {
+        return;
+      }
       const range = resolveAnchor(anchor);
       if (!range) {
-              continue;
+        return;
       }
 
       const event = new CustomEvent('scrolltorange', {
@@ -307,12 +308,10 @@ export default class Guest {
         detail: range,
       });
       const defaultNotPrevented = this.element.dispatchEvent(event);
+
       if (defaultNotPrevented) {
         scrollIntoView(anchor.highlights[0]);
       }
-          }
-        }
-      }
     });
 
     // Handler for when sidebar requests metadata for the current document